Detection of Presence of Towed Radar Active Decoy Based on Extended Monopulse Ratio
Zaiqi Lu · Acta Aeronautica Et Astronautica Sinica · 2011
The detection of the presence of the decoy is the foundation of countering the towed radar active decoy(TRAD) and it determines the effect of the ECCM.When the radar seeker transmits several different frequency pulses,the echo amplitude of the target follows the Rayleigh distribution and that of the decoy is assumed fixed.This paper presents an analysis of the variation of the echo characteristic in the radar beam and when a towed decoy exists extracts the feature distinction of the echoes amplitude and the corresponding monopulse ratio under the two hypotheses that the decoy is present or not.The conditional probability density functions(pdfs) of the extended monopulse ratio are given when the radar seeker adopts the amplitude comparison monopulse under above two hypotheses are given.The detection of presence of the TRAD based on the generalized maximum likelihood ratio(GLRT) is developed which adopts the Neyman-Pearson method and the processing flow of the decoy detection is also given.Simulation results under different conditions and scenarios illustrate the performance of the proposed method is effective and satisfy the requirement of ECCM.